Terahertz frequency band local oscillation source based on frequency multiplication link circuit integrated structure

[0024] The terahertz frequency band local oscillator source based on the integrated structure of the frequency doubling link according to the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0025] Referring to the local oscillator sources in the terahertz frequency band shown in 1 and 2, the present invention provides a local oscillator source in the terahertz frequency band based on the integrated structure of the frequency doubling link. The local oscillator source includes: an upper cavity 1 and a lower cavity body 2;

[0026] The upper cavity 1 includes: a first Y-junction 3, a first double frequency 5, a third double frequency 7, a third Y-type junction 9, a fifth double frequency 11, and a first input waveguide port 13 and the first output waveguide port 15;

[0027] The lower cavity 2 includes: a second Y-type junction 4, a second double frequency 6, a fourth double frequency 8, a fourth Y-type junction 10, a sixth double frequency 12, and a second input waveguide port 14 and the second output waveguide port 16;

[0028] The surface of the upper cavity 1 and the surface of the lower cavity 2 are closely joined to form a complete local oscillator source module; the first Y-junction 3 and the second Y-junction 4 constitute a Y-type power divider 17; The double frequency 5 and the second double frequency 6 constitute the first double frequency doubler 19; the third double frequency 7 and the fourth double frequency 8 constitute the second double frequency doubler 20; the third Y type The junction 9 and the fourth Y-junction 10 constitute a Y-type combiner 18; the fifth double frequency 11 and the sixth double frequency 12 constitute the post-stage doubler 21; the first input waveguide port 13 and the second input waveguide The port 14 constitutes the input port 22 ; the first output waveguide port 15 and the second output waveguide port 16 constitute the output port 23 .

[0029] When the output power of the local oscillator module is required to be larger, the input power needs to be increased accordingly. When the input power exceeds the power that a single frequency doubler can withstand, the Y-type power divider can be used to divide the power of the input signal into two channels and feed them into the two frequency doublers. The Y-type combiner is used at the terminal to combine the two powers into one signal, so as to obtain a larger output power.

[0030] Based on the local oscillator source of the above structure, the input port 22 is connected with the Y-type power divider 17, and the power of the fundamental frequency input signal input through the input port 22 is equally divided into two paths by the Y-type power divider 17; The two output terminals of the Y-type power divider are connected with two front-stage frequency doublers with exactly the same structure: the first front-stage frequency doubler 19 and the second front-stage frequency doubler 20; On the pre-stage frequency doubler, the fundamental frequency input signal completes the frequency doubling process for the first time; the output terminals of the two pre-stage frequency doublers are connected with a Y-type combiner 18, which is used to double the first pre-stage frequency. The two-way signals output by the frequency converter 19 and the second front-stage frequency doubler 20 are synthesized into one signal; After the synthesized signal enters the post-stage frequency doubler 21 , the second frequency double processing is completed, and the second frequency doubled signal is output through the output port 23 . Taking the input operating frequency of the local oscillator source design of the present invention as 83 GHz as an example, a signal with a frequency of 332 GHz can be obtained after twice frequency doubling processing.

[0031] In the above-mentioned local oscillator source, the two front-stage frequency doublers and the latter-stage frequency doubler are integrated into a cavity module, thus greatly improving the reflection between the port surfaces, and at the same time making the structure more compact and smaller. , so that the external dimension of the local oscillator source can be designed to be 3cm×2.5cm×2cm.

[0032] The upper cavity 1 and the lower cavity 2 can be made of hard aluminum material, and the surfaces thereof are plated with gold to prevent oxidation.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention will not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the present invention. within the scope of the claims.